In 4-quart or larger cylindrical glass bowl or trifle dish, place half of lettuce, then half of tomatoes; top with all of beans, all of peppers, remaining lettuce, then remaining tomatoes. Arrange avocados on top. Spoon dressing over avocados to cover completely. If not serving right away, cover bowl tightly with plastic wrap and refrigerate salad until ready to serve or up to 4 hours.

If serving bowl is not large enough for mixing, transfer salad to very large bowl and toss until well coated with dressing. Makes about 14 cups.

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